Boring and trepanning toolholder



2 1951 M. J. SCHLITTERS 2,564,728

BORING AND TREPANNING TOOL HOLDER Filed May 17, 1948 I 3nnentor- MichaelJ. Schlittare Gttorneg Patented Aug. 21, 1951 UNITED STATES PATENTOFFICE BORING AND TREPANNING TOOLHOLDER Michael J. Schlitters, Detroit,Mich.

Application May 17, 1948, Serial No. 27,592

2 Claims. 1

This invention relates to boring tool holders and particularly toolholders suited for automatic screw machine and turret lathe use inperforming boring and other operations. More specifically, the inventionrelates to a tool holder of a type in which a boring bar carrier isslidable across the axis of a head fixed on a tool shank, an adjustingscrew being installed on said head to position such carrier selectivelyon the head, and provision being made to clamp the carrier in anyposition established by the screw.

An object of the invention is to adapt a boring tool carrier to undergosliding adjustment between two guide rails, one of which is adapted toapply clamping pressure to the carrier for holding it selectivelyadjusted.

Another object is to render said clamping rail detachable to facilitateassembly and disassembly of the tool holder. 7

Another object is to provide an improved mounting for a screw employedto slidingly adjust the boring bar carrier.

Another object is to provide an improved actuating connection from thescrew to said carrier.

These and various other objects are attained by the constructionhereinafter described and illustrated in the accompanying drawing,wherein:

Fig. 1 is a front elevational view of the improved tool holder.

Fig. 2 is a side elevational view of the same.

Fig. 3 is a view of the tool-receiving end of the holder.

Fig. 4 is a cross sectional view of the holder taken on the line 44 ofFig. 1.

Fig. 5 is an axial cross section taken on the line 55 of Fig. 2.

Fig. 6 is an axial cross section on the line 6-6 of Fi 1.

In these views, the reference character I designates a cylindrical shankintegrally and termina ly formed with an enlarged head 2. Slidable insaid head across its central axis is a tool carrier 3, guided in suchtravel by rails 4 and 5 on the head 2. The carrier has a dovetailed rib6 fitting between said rails which are undercut conformingly to suchrib. The rail 5 is detachable, being secured to the head by headedscrews 7. When these are tightened, the rib is clamped firmly betweenthe two rails to positively maintain any desired position of slidingadjustment of the carrier 3. The latter is formed with a central boss 8on its face remote from the head 2, such boss having a socket 9 toreceive a boring bar (not shown), and set screw socket. The rail 5 has atongue II extending from end to end of such rail and fitting into agroove of the head 2 to assist in accurately maintaining the intendedposition of such rail.

A substantially rectangular chamber l2 opens into the head 2 from itsend face between the rails 4 and 5, such chamber being elongated inparallelism with the rails. Extending through said chamber from end toend thereof and journaled in its end walls, is an adjusting screw I3,projecting at one end exteriorly of the head and formed on such end witha knob l4 having a serrated rim. To resist endwise travel of said screw,it is engaged between the knob l4 and a collar l5 on the screw by aplate l6 set into the front face of the head 2 and rigidly mounted onthe latter by screws [1. Said plate has a U- shaped pocket l8accommodating an unthreaded portion of the screw between the knob andcollar thereof, said collar serving as a journal for the front end ofthe screw. Slidably fitted in the chamber 12 is a rectangular feed nutl9 engaged and actuable lengthwise of said chamber by the screw l3. Anend portion of said nut engages the carrier 3, fitting the width of agroove 20 machined in the inner face of the carrier and elongatedtransversely to the chamber II. An index line 21 on the plate It coactswith the serrations on the knob [4 to accurately indicate smallincrements of rotational travel of the screw l3. 1

In use of the described tool holder, the carrier 3 is normally clampedfirmly to the head 2 by the screws 1. When it is desired to vary thecutting radius, said screws are loosened slightly so that the carriermay slide freely. The screw I3 is then rotated to shift the carrier bymeans of the nut l9 to a desired position. The screws 1 are then againtightened to maintain such position.

The construction affords the carrier a desirably large range of slidingadjustment and provides in a thoroughly positive manner for maintainingany adjustment. Furthermore, the construction is relatively simple andinexpensive and ready access may be had to all its parts in case of anyreplacements or repairs. Said tool holder is well suited to trepanningoperations as well as for boring.

What I claim is:

1. A tool holder comprising a shank having a head, an adjusting screwrotatable in said head and disposed transversely to the extended axis ofsaid shank, a tool carrier slidable across said head and formed with aguide rib elongated in substantial parallelism with and projectingtoward said screw, a pair of guide rails for said carrier extending onthe head at opposite sides of said rib and overlapping the rib to retainthe tool carrier on the head, one of said rails being detachable, acommon means for securing the detachable rail to the head and forclamping said guide rib between the rails to hold the tool carrierselectively adjusted, means resisting axial movement of the adjustingscrew, said head having a chamber extending into its end face betweensaid rails and the adjusting screw being extended through such chamber,and a feed nut engaging the screw and non-rotatively fitted in saidchamber and projecting into the tool carrier to effect sliding of suchcarrier, the tool carrier being grooved transversely to the length ofthe screw for operatively receiving the projecting portion of the nut.

' 2'. A tool holder comprising a/shank having a head, an adjust ng screwrotatable in said head and disposed transversely to the extended axis ofsaid shaz a tool carrier slidable across said head and formed with guiderib elongated in substantial parallelism with and projecting toward saidscrew, a pair of guide rails for said serted 1n the tee-i 4 carrier,.vhile rier from the nut.

MZCHAEL J. SCHLITTERS.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 892,894 Roman July '7, 19081,133,169 Morris Mar. 23, 1915 1,153,673 Bryant Sept. 14, 1915 1,960,124Russell May 22, 1934 2,403,336 Brown July 2, 1946

